Other Parts Discussed in Thread: DRV8847, TXS0102, DRV8850, LM339
Hello,
I would like to use DRV8847 and stall detection method as shown in this A.N. https://www.ti.com/lit/an/slva858/slva858.pdf
But the difference is my power supply is expected to be 3,3 V instead of 12V. This provides an output of 1,65 V so some adaptation will be needed to raise logic voltage in order to match my MCU (from Vmotor:1,65V to Vih-min-mcu = 2,475V). What adaptation do you recommend? . My guess:
- OpAmp (G = 2).
- Voltage comparator. Could you suggest a part?
- Level adapter (TXS0102). But I am afraid this solution requires a stable power supply in both sides. right? so I would need an extra regulator, right?
What adaptation do you recommend?
Other thing: I am also thinking about using DRV8850 Since this part does not provide current regulation/chopping the previous stall detection circuit would not apply, right? I think I would have to use Vpropi as stall detector instead. In this case, what do you recommend to capture Vpropi? ADC o voltage comparator?
Regards, Ramon.
